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Lateral-force resisting mechanisms of flexure-dominant multi-story structural walls sustained on soft-first-story

Authors
M. Sakashita,Y. Idosako,X. Feng,M Nishiyama.
Year
2014
Book Title or Journal
New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
Number
24
Number of pages
8
Description
This paper presents lateral-force resisting mechanisms of flexure-dominant multi-story structural walls on a soft-first-story. Two reinforced concrete specimens consisted of the 3-story-high structural wall on the soft-first-story were constructed in 1/3-scale and tested under cyclic loading simulating earthquake motions. The test variable was the longitudinal reinforcement ratio in the boundary beam of the 2nd floor, which was 1.19% or 2.56%. The structural walls yielded in flexure as intended, which, however, did not result in the concentration of deformation only on the 2nd story. The reason is that the boundary beam yielded in flexure and tension, and a yielding mechanism other than intended was formed. The difference in load capacity between the two specimens was not of significance. The mechanism needed as large drift angle as approximately 2% to attain the design lateral load capacity. The beam-column joints on the 2nd floor failed, which resulted in an inability to sustain the axial load.
Tags
soft story,lateral force

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